Mission statement" Our goal is to help make Brent Borough a place where people live their lives free from crime and the fear of crime"source: CCTV Marketing Brief Banner ad testing (We estimate the likely response )

Sample size = (confidence level)2 x expected response x non-response

(error tolerance)2

we allow a 90 per cent probabilityanticipate a response of 2.5 per cent error tolerance at 0.25 per cent